P0989 — Transmission Fluid Pressure Sensor/Switch E Circuit Low

P0989: Transmission Fluid Pressure Sensor/Switch E Circuit Low — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Transmission Fluid Pressure Sensor/Switch E Circuit Low. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The transmission may shift irregularly or show a warning.
  • Some vehicles can limit gearbox operation.

Possible causes

  • An electrical sensor/switch E fault or damaged connections can produce the low signal.
  • A low electrical reading does not alone confirm low hydraulic fluid pressure.

What to check

  • Confirm P0989 and inspect sensor E wiring and connector.
  • Compare signal voltage and live pressure values with the vehicle specifications.

Also written as: P0989-00, P098900, PO989 (some scan tools add the fault-type byte, e.g. -00).